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Priority to JP5264881UpriorityCriticalpatent/JPH0438435Y2/ja
Priority to US06/357,475prioritypatent/US4430532A/en
Priority to GB8207581Aprioritypatent/GB2096831B/en
Publication of JPS57164922UpublicationCriticalpatent/JPS57164922U/ja
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Publication of JPH0438435Y2publicationCriticalpatent/JPH0438435Y2/ja